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exfat: truncate atimes to 2s granularity

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exfat atimes are restricted to only 2s granularity so after
we set an atime, round it down to the nearest 2s and set the
sub-second component of the timestamp to 0.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
This commit is contained in:
Eric Sandeen 2020-04-17 15:47:40 +09:00 committed by Namjae Jeon
parent b0333de3ff
commit 09241c144b
5 changed files with 20 additions and 1 deletions
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1
exfat_fs.h
View File

@ -519,6 +519,7 @@ void exfat_msg(struct super_block *sb, const char *lv, const char *fmt, ...)
void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
u8 tz, __le16 time, __le16 date, u8 time_ms);
void exfat_truncate_atime(struct timespec64 *ts);
void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
u8 *tz, __le16 *time, __le16 *date, u8 *time_ms);
unsigned short exfat_calc_chksum_2byte(void *data, int len,

2
file.c
View File

@ -300,6 +300,7 @@ int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry,
#endif
generic_fillattr(inode, stat);
exfat_truncate_atime(&stat->atime);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
stat->result_mask |= STATX_BTIME;
stat->btime.tv_sec = ei->i_crtime.tv_sec;
@ -374,6 +375,7 @@ int exfat_setattr(struct dentry *dentry, struct iattr *attr)
}
setattr_copy(inode, attr);
exfat_truncate_atime(&inode->i_atime);
mark_inode_dirty(inode);
out:

10
misc.c
View File

@ -94,7 +94,8 @@ void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
if (time_ms) {
ts->tv_sec += time_ms / 100;
ts->tv_nsec = (time_ms % 100) * 10 * NSEC_PER_MSEC;
}
} else
ts->tv_nsec = 0;
if (tz & EXFAT_TZ_VALID)
/* Adjust timezone to UTC0. */
@ -134,6 +135,13 @@ void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
*tz = EXFAT_TZ_VALID;
}
/* atime has only a 2-second resolution */
void exfat_truncate_atime(struct timespec64 *ts)
{
ts->tv_sec = round_down(ts->tv_sec, 2);
ts->tv_nsec = 0;
}
unsigned short exfat_calc_chksum_2byte(void *data, int len,
unsigned short chksum, int type)
{

7
namei.c
View File

@ -629,6 +629,7 @@ static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
inode->i_mtime = inode->i_atime = inode->i_ctime =
EXFAT_I(inode)->i_crtime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&inode->i_atime);
/* timestamp is already written, so mark_inode_dirty() is unneeded. */
d_instantiate(dentry, inode);
@ -908,6 +909,7 @@ static int exfat_unlink(struct inode *dir, struct dentry *dentry)
#else
dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&dir->i_atime);
if (IS_DIRSYNC(dir))
exfat_sync_inode(dir);
else
@ -919,6 +921,7 @@ static int exfat_unlink(struct inode *dir, struct dentry *dentry)
#else
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&inode->i_atime);
exfat_unhash_inode(inode);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
exfat_d_version_set(dentry, inode_query_iversion(dir));
@ -983,6 +986,7 @@ static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
inode->i_mtime = inode->i_atime = inode->i_ctime =
EXFAT_I(inode)->i_crtime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&inode->i_atime);
/* timestamp is already written, so mark_inode_dirty() is unneeded. */
d_instantiate(dentry, inode);
@ -1104,6 +1108,7 @@ static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
#else
dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&dir->i_atime);
if (IS_DIRSYNC(dir))
exfat_sync_inode(dir);
else
@ -1116,6 +1121,7 @@ static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
#else
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&inode->i_atime);
exfat_unhash_inode(inode);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
exfat_d_version_set(dentry, inode_query_iversion(dir));
@ -1494,6 +1500,7 @@ static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
EXFAT_I(new_dir)->i_crtime = CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&new_dir->i_atime);
if (IS_DIRSYNC(new_dir))
exfat_sync_inode(new_dir);
else

1
super.c
View File

@ -547,6 +547,7 @@ static int exfat_read_root(struct inode *inode)
inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =
CURRENT_TIME_SEC;
#endif
exfat_truncate_atime(&inode->i_atime);
exfat_cache_init_inode(inode);
return 0;
}